Alex Hryhorenko

Software development

2015 - 2017

STEP Computer Academy

Specialized in software development and system architecture, gaining a solid foundation in modern technology stacks and development methodologies.

Bachelor's Degree Industrial and Civil Engineering

2011 - 2015

Dnepropetrovsk Academy of Construction and Architecture

Focus on software engineering, programming languages, and collaborative project work, setting the stage for a career in software development.

Fullstack Developer

04/2024 – 11/2024

24sju, Sweden

• Developed and maintained backend services using Node.js, integrating APIs with Swagger documentation for seamless team collaboration.
• Optimized the payment system in self-checkout kiosks, resolving issues with duplicate transactions by rewriting inefficient code and reducing delays.
• Designed a central server for distributing audio tracks to Raspberry Pi devices in stores, ensuring synchronized music and advertisement playback.
• Rewrote software for store scales to ensure accurate display of product information and pricing.
• Supported and optimized legacy CRM systems for better performance and usability.
• Worked closely with Indian developers to streamline cross-team integration and improve project delivery timelines.

Accomplishments

• Migrated and optimized statistical data pipelines to AWS for improved scalability and efficiency.
• Strengthened international collaboration skills through direct client interactions and teamwork.

Fullstack Developer

02/2024 – 09/2024

Yolo, Dubai

• Built a corporate website with a user account system using Next.js and Strapi, implementing server-side rendering (SSR) for optimal performance and SEO.
• Migrated the database from SQLite to PostgreSQL, ensuring better scalability and data reliability.
• Developed a mobile application using Flutter for real-time property listings, callback requests, and notifications.
• Integrated backend systems for seamless communication between the website and mobile applications, enhancing data synchronization.
• Implemented multilingual support and localization for both the web platform and the mobile app to cater to an international audience.

Accomplishments

• Successfully optimized SSR, reducing page load times by 30%.
• Delivered a robust platform, increasing user engagement and order processing efficiency by 40%.
• Expanded technical expertise by mastering new technologies, including Flutter and advanced localization practices.

Team Lead

03/2022 – 03/2024

24sju, Poland

• Directed the development of self-checkout kiosks using Angular and Electron for Windows, integrating touchscreens, barcode scanners, and receipt printers.
• Designed offline storage mechanisms, increasing capacity from 10 MB to 50 MB and enabling offline operation in stores with unstable internet.
• Implemented a QR-based access control system for Norwegian stores, integrating banking systems for secure authentication.
• Migrated the monolithic system to AWS using Docker containers, RabbitMQ for microservices, and DynamoDB for scalable data storage.
• Collaborated directly with clients, gathering requirements, providing updates, and ensuring alignment with business needs.
• Debugged systems via SSH tunnels and PM2, monitoring remote kiosks and ensuring stable operation.

Accomplishments

• Managed and mentored a team of 6 developers, leading code reviews and daily stand-ups.
• Increased server capacity from 25 to 100 stores using Nginx load balancing.
• Reduced error resolution time by 40% with real-time Telegram notification bots.
• Introduced vending machine integrations and optimized terminal software for scalability.

Frontend Developer

12/2021 – 02/2022

Secret Cloud

• Joined as a junior front-end developer in a large team, including QA engineers, mobile developers, front-end and back-end specialists.
• Collaborated using modern tools like Git, Jira, and daily stand-ups to discuss progress and challenges.
• Enhanced application performance and user interfaces using React and Redux, focusing on state management and data visualization.
• Contributed to a government project focused on secure data exchange within organizations:
  • Developed a secure system for file sharing, allowing employees to upload, edit, delete, and exchange files.
  • Added drag-and-drop functionality for file management, improving user experience.
  • Integrated email-based file sharing for seamless collaboration.
• Participated in the continuous improvement of application features and bug fixes.
• Built a strong professional relationship with my mentor, leveraging guidance to rapidly enhance my skills.
• Gained experience in working within an Agile environment, significantly improving my understanding of teamwork and project lifecycle.

Frontend Instructor

09/2020 – 01/2022

IT STEP

• Conducted both offline and online lessons 4 times a week, teaching students aged 16 to 80 years old, without age restrictions.
• Taught foundational and advanced concepts of HTML, CSS, React, and Angular, focusing on practical applications in frontend development.
• Adapted teaching materials to suit individual student needs and offered additional guidance on backend topics when required.
• Successfully graduated 6–7 groups of students, providing them with strong technical foundations for careers in web development.

Accomplishments

• Inspired and trained students of varying skill levels, helping them achieve confidence in frontend technologies.
• Developed a structured curriculum to ensure a balance of theory and practical skills.
• Fostered an engaging learning environment, supporting students in completing personal and group projects.

Junior+ Fullstack Developer

05/2020 – 11/2021

Trade, Dnipro Ukraine

• Developed landing pages and enhanced existing websites, optimizing performance and design.
• Integrated external CRM systems with existing solutions to improve client data management.
• Configured and integrated payment systems, automating financial operations.
• Built an internal CRM system using React, Node.js, and MySQL to streamline order management:
  • Automated order transfer processes between specialists with status updates and comments.
  • Implemented features for uploading photos, filtering, and sorting orders, improving data processing.
  • Migrated and optimized data from Exel tables to MySQL for handling large datasets.
• Promoted to team leader, managing two developers:
  • Conducted interviews and optimized task distribution to enhance team efficiency.